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Quick integration

Q: int x/[(x^2+y^2)^2]

I forgot how to do this, I think it's integration by parts. Can someone please help me start it off?
There will be a substitution. What are you integrating with respect to?

Assuming it's x, use a substitution such as x = ytan(u) [or]
Original post by Superman_Jr
Q: int x/[(x^2+y^2)^2]

I forgot how to do this, I think it's integration by parts. Can someone please help me start it off?


Are you integrating wrt x and given y as a constant?

If so, I would try u = x^2 + y^2 as a substitution. Marcus' substitutions should also work but are longer.

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